1901-1906
California Gas and Electric Corporation
Alameda Gas Company Alameda Gas Light Company Benecia Gas Company Berkeley Gas Light Company California Central Gas and Electric Company Capital Gas Company (Sacramento) Chico Gas and Electric Company Chico Gas Company Chico Gas, Electric Power and Lighting Company Citizens Gas Light and Heat Company (Sacramento) Citizens Gas Light Company (Sacramento) Colusa Gas and Electric Company Colusa Gas Company Consolidated Electric Light, Gas and Power Company (Woodland) Fresno Gas and Electric Light Company Fresno Gas Company Fresno Gas Light Company Garden City Gas Company (San Jose) Globe Gas Company San Jose Grass Valley Gas and Electric Light Works Grass Valley Gas Company The Grass Valley Gas Company Marysville Coal Gas Company Napa City Gas Light and Heating Company Napa City Gas Light Company Napa Gas and Electric Company Nevada City Gas Company Nevada City Gas Works Nevada County Gas and Electric Company Oakland Equitable Gas Company Oakland Gas Light and Heat Company Oakland Gas Light Company Petaluma Gas and Electric Company Sacramento Electric Gas and Railway Company Sacramento Gas Company San Jose Gas Company San Jose Gas Works San Mateo Gas Light Company San Rafael Gas and Electric Company San Rafael Gas Company Santa Rosa Gas Light Company United Gas and Electric Company (San Mateo and Santa Clara Counties) Vallejo Gas Company Vallejo Gas Light Company Woodland Gas and Electric Company Woodland Gas Company

1912-1927
Coast Valleys Gas and Electric Company
Monterey County Gas and Electric Company Monterey County Gas and Electric Company Water Properties Monterey Gas and Electric Company Salinas City Gas and Electric Company

1915-1930
Great Western Power Company of California
Universal Electric and Gas Company (San Francisco)

1913-1930
Midland Counties Public Service Corporation
Midland Counties Gas and Electric Company (San Luis Obispo, Santa Maria and Paso Robles) San Luis Obispo Gas and Electric Company Santa Maria Gas and Electric Company

1908-1919
Northern California Power Company, Consolidated
Red Bluff Gas Company Redding Gas Company

1896-1906
San Francisco Gas and Electric Company
Aubin Gas Company (San Francisco) Central Gas Company (San Francisco) Central Gas Light Company (San Francisco) Citizens Gas Company (San Francisco) City Gas Company (San Francisco) Equitable Gas Light Company (San Francisco) Independent Gas and Power Company (San Francisco) Metropolitan Gas Company (San Francisco) Metropolitan Gas Corporation (San Francisco) Oriville Gas, Electric Light and Power Company Pacific Gas Improvement Company (San Francisco) San Francisco Coke and Gas Company San Francisco Gas Company San Francisco Gas Light Company United Gas Improvement Company (San Francisco)

1910-1930
San Joaquin Light and Power Corporation
Bakersfield Gas and Electric Fresno Gas and Electric Company Merced Falls Gas and Electric Company Merced Gas Corporation

1910-1927
Western States Gas and Electric Company
Central Natural Gas Company (Stockton) Citizens Natural Gas Company (Stockton) The Citizens Natural Gas Company (Stockton) The Eureka Gas Company Eureka Gas Works Humboldt Gas and Electric Company Northern Natural Gas Company (Stockton) Stockton Gas and Electric Company Stockton Gas and Electric Corporation Stockton Gas Company Stockton Gas Light and Heat Company Stockton Gas Light and Heat Company (reorganized) Stockton Natural Gas Company

1884-1926
Independent Predecessor Acquisitions
California Gas and Electric Corporation Coast Valleys Gas and Electric Company Fowler Gas Company Lodi Natural Gas Company Los Gatos Gas Company Los Gatos Ice, Gas and Electric Company Modesto Gas Company Modesto Gas Light, Coal and Coke Company Natural Gas Corporation of California (Kern and King Counties) Oakdale Gas Company Sacramento Gas Company Sacramento Natural Gas Company San Francisco Gas and Electric Company San Leandro Gas and Electric Light Company Santa Clara Municipal Gas System Solano Electric Light and Gas Company Tracy Gas Company Washington Electric Gas and Fuel Company (West Sacramento) Western State Gas and Electric Company